Metal-drilling machine



F. K, LANDGRAF. METAL DRILLING MACHINE.

APPLICATION FILED MAR. 15, I 9I'9- 1,417,181. Patented y'23,1922. 3SIIEETS-SHEET I.

' 3-:- L- I 36 30 32 I I ,I 7 30 I 3 I i -2 j 07 v E" M I I aa 28 I 8 I 67,- I J [7 I.

7 "I I I 72 I v I2 g 1 16 V176 x I 5 I 15 I I I I I; I a; I J L m ,6! I L 1 1 J I J L m .I 4 #4 .9 7 J J L H L /0 10 -B a g I 5 I 0- 3 III III I II I IIIJI I III I' IIIIII IIIII I II IUT II UU I M v as Y I3 5 I I I I I I I a w b 7 I 38 7 I a;

F. K. LANDGRAF.

METAL DRILLING MACHINE.

. 1,417,181. APPLICATION man MAR. 15; 7919. Patented May 23 1922' 3 SHEETS-SHEET 3.

// Ax A err-a ra'rnr FREDERICK K. LANDGRAF,OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO FLAN- NERY BOLT COMPANY, 015 PITTSBURGH, PENNSYLVANIA.

METAL-DRILLING MACHINE.

Specification of Letters Patent. Patey t d pl y 23 1922.

Application filed March 15, 1919. Serial No. 282,867.

ing tell-tale holes in boiler staybolts,one

object of the invention being to provide controlling means which will allow the drilling tool to feed as slowly as the constant pressure applied to said tool willmove it, but prevent said tool from feeding at greater than a predetermined speed in the event of varying resistance ofiered to the progress of the tool by varying texture or density of the metal being drilled.

A further object is to provide ina drill.-

ing machine in which the tool is fed by the operation of ram means whereby the tool will be permitted to feed as slowlyas the constant pressure of the ram will move it, but prevent said tool from feeding faster than a predetermined rate of speed should conditions be such that the tool would other- 3 wise tend to feed faster than such predeter-' mined rate of speed.

machine in which the tool is fed by. the operation of a ram means which will permit the tool to feed as slowly as the constant pressure of the ram will move it but which will hold the speed of feed of the tool to a predetermined rate of speed in the event that said tool encounters a soft spot in the work being drilled. a

A further object is to drill a hole or bore ina metal bar or bolt in such manner that should a soft spot or a hard spot be enof construction and combinations of parts as hereinafter set forth and pointed out in the claims. In the accompanying drawings; Figure 1 is an elevation partly broken away and partly in section; Figures 2, 8 and l are en larged views showing details of construction; Figures 5 and 6 are enlarged views illustrating the control mechanism, and Figure 7 is a cross section of the drilling tool.

1 represents suitable framework for supportlng a battery of drilling units,all of which are the same in construction'and mode of operation. The framework comprises upper and lower cross bars 2 and 3, between which vertical guides 1 are located for the accommodation of cross heads 5 with which rains 6 are connected,said cross-heads also serving to receive and carry drilling tools 8. The rams 6 operatein cylinders 7 which may be supplied with oil from a suitable pumping system or pressure reservoir (not shown) and each ram is made tubular as shown in Figures 1 and 3'. Each drill tool 8 has an oil passage 8 (Fig. 7) extending throughout its length and this passage coinmunicates with the tubular ram, so that a portion of the oil which actuates the ram passes up into and'through the drill for lu bricating its upper cutting edge and also for washing out the chips, substantially as shown and described in Letters Patent granted to me on the Tthday of October,

\ 1919, No. 1,317,711. Each. drill 8 passes A further object is to provide in a drilling through supports 9 which normally rest upon shoulders 10 on the guides and prevent lateral deflection ofthe drill at points inter mediate of its length.

The intermediate cross bar 2 of the framework is perforated to receive adjust able sleeves or blocks 11 carrying drill bushings 11 through which the drills pass, and each bushing is made conical at its upper end to enter a centering recess in the lower end of a staybolt 12, in which latter the telltale hole is to be drilled. The lower portion of the bushing may be counterbored as shown at 11 and communicate with a chamber 11 in the sleeve or block 11, which may receive oil and cuttings. In order to facilitate longitudinal adjustment of the sleeves or blocks 11, each may be made with a rack bar 13 to receive a pinion 1e carried by a spindle 15, and the latter may beoprovided with a hand wheel 16 for turning said splndle and pinion.

A cross bar 17 is located above and spaced from the cross bar 2" and carries bushings 18 in which chucks 19 are mounted to rotate,- said chucks being adapted at their lower ends to receive the upper headed end of the work (the staybolts) and they are provided with 'ton'guestor keys 20 to enter the slots in said headed ends of the staybolts so that the latter will be caused to be rotated by the chucks. Each chuck projects above the cross bar 17 and is provided at its upperend with the bearing may be locatedbetween the lower end ofthe threaded bushing 24 and theupper clutch member 22, and above said threaded bushing, a collar 26 may be secured to the shaft 23. A hand lever 27 may be secured to each threaded bushing 24 for turning the latter to move the upper clutch member 22 relatively to the lower clutch member 21 and thus control the rotation ofthe staybolt.

The'upper portion of each shaft 23 enters a tubular shaft 28, and is made with a keyway to receive a key carried by said tubular v shaft, so that the shaft23 will berotated by the tubular shaft and yet be capable of an endwise movement relatively thereto to permit movement of the clutch member 22. The tubular shafts28-have secured thereto, stub- V shafts 29 mounted in the upper cross bar 2 of the framework and these stub shafts carry bevelfpinions 30 which receive motion from bevel pinions 31 on a driving shaft 32,the

latter being provided with a pulley 32 to receive a belt from any suitable source of power.

At respective ends of the machine, th cross-head guides, indicated at 4, terminate below the cross bar 17 and in the upper ends of said guides 4, the lower ends of screw-rods 33 are 'swiveled. These screw-rods pass through threaded bushings 34 secured to the cross bar 17 and they also pass freely through holes in the cross bar .2" and through the upper cross bar. The free endof one of the screw rods may be,-made angular as indicated at 35 to receive a wrench or-lever and the two screw rods are provided with sproclc et wheels 36, 36 connected by an endless sprocket chain 37, whereby when power is applied to one of said rods, both of them will be turned and thus the cross bar 17 and with ;itthe driving mechanism may be raised or lowered to accommodate different lengths of i boltstobe drilled.

In order to protect the drills and thereby greatlyIeconomize-in 'the number of drills which may be necessary in the continual operation of the machine, it is important that the feed during the drilling operation shall be so controlled that its speed will not exceed a predetermined'rate regardless of the'fact that soft spotsmay be encountered which would, if not guarded against, cause such a variance in the feeding speed as would result in damage to the drilling tool. To prevent such variance in feeding speed and to insure the constancy or uniformity of thefeed with in safe limits under all conditions of the parts of the work beingdrilled, andfprevent damage to the tool, the devices now to be described have been found to be effectual.

To each cross head 5 a cylindrical rodor bar 38 is secured so as to be movable vertically with the ram and the drilling tool, and said bar is made with teeth whereby a rack bar 39 is formed. A control shaft 40 is mounted in suitable bearings inthe framework and extends from end to end of the latfor. The control shaft 40 has loosely mounted thereon, a plurality of pinions 41 to mesh against the pinion and at the other end against a collar 45 secured to the shaft 40.

It may be here stated that the ratchetor clutch connection between the pinion 41 and collar 43 is such that the pinion will bepermitted to revolve at any rate of speed :less than thatof the control shaft. A guide 46 is provided for each rack bar to hold the same in mesh with a pinion and lostmotion is eliminatedby spring-pressed plunger 47 associated with said guide.

Each bar 38 is provided at its :upper end with a hand lever 47 to facilitate the turning of the'same to move the rack bar out of mesh with thepinion and thus permit the control feature of the machine to be thrown out of action-or to permit the cross head to i ward. direction upon the drill tool and should a soft spot in the material being .d-rilled, be encountered by thetoohth'e tend 'ency would be for the latter to be fed too fast for its own safety, but with my "imbetween the ram and tool and the control shaft,--the latter running at a predetermined speed,-and the speed of the feed will thus be controlled by the control shaft notwithstanding the encounter of the tool with a soft spot in the material. In view of the fact that each pinion 41 is loose on the control shaft and that the ratchet connections between said pinion and the control shaft are such that the pinion can rotate as fast as or slower than the speed of rotation of said control shaft, said pinion cannot rotate any faster than the speed of rotation of said shaft. The pinion ll being connected with the tool carrying cross head of the'ram through the medium of the rack bar 38-39, it is apparent that while the drill tool. may feed as slowly as the constant pressure of the ram will move it, still should the conditions be such that it would tend to move faster (as when the drill tool encounters a soft spot in the work) than the speed of the control shaft determined by the planetary gearing, then the meshing of the pinion 41 with the rack bar and the ratchet connection of said pinion with the control shaft will operate to retard or hold back the speed of the upward feedingof the drill tool to the predetermined maximum rate of the control shaft.

A very hard spot encountered by the drill would be detrimental to the cutting edge,- if not to the entire drill,and for that reason it is desirable that in such a case, the upward movement of the drill be governed only by the movement of the ram. If the spot be so hard that the advance allowed by the control shaft is greater than that which is satisfactory to the drill, the pinion 41 will slip on the control shaft.

I do not in this case claim broadly the method which consists in rotating the work to be drilled, simultaneously feeding a tool longitudinally with relation to the workunder constant fluid pressure and simultaneously conducting oil from the source of fluid pressure to the cutting end of the tool during the drilling operation, the same being covered in Letters-Patent granted to me on the 7th day of October 1919 No. 1.317,?11.

Various changes might be made in the details of construction of my invention without departing from the spirit thereof or limiting its scopeand hence I do not wish to restrict myself to the precise details herein set forth.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is

1. In a drilling machine, the combination with rotating means, and longitudinally movable constant fluid pressure feeding means, one of said means constituting a work receiver and the other of said means constituting a tool carrier, and constant fluid pressure means for feeding one of said means relatively to the other, of means geared to said constant fluid pressure feeding means and operating to limit the speed to a predetermined rate regardless of varying resistance offered by varying texture of the work.

2. In a drilling machine, the combination with constant fluid pressure means, rotating means, one of said means constituting a work receiver and the other of said means constituting a tool carrier, and driving means, of control devices interposed between said constant fluid pressure feeding means and said driving means and geared to the latter to limit the speed of said constant fluid pressure feeding means to a predetermined rate.

3. In a drilling mechanism, the combination with a work receiver, a tool receiver, driving means for the work receiver, means for moving the tool receiver relatively to the work receiver, and a main driving shaft geared to said driving means, of a control shaft geared to said driving shaft, and gearing between said moving means and said control shaft, whereby the speed of feed of one of said receivers relatively to the other willv be limited to a predetermined rate regardless of varying resistance offered by varying texture of the work being drilled.

4. In a drilling machine, the combination with a work receiver, a tool carrier, driving means for the work receiver, and constant pressure feeding means for the tool carrier, of a control shaft, gearing between the tool carrier and the control shaft, a driving shaft. gearing between the driving shaft and the driving means of the work receiver, and gearing between said driving shaft and the control shaft, said last mentioned gearing operating to limit the speed of the control shaft to a predetermined rate.

5. In a drilling machine, the combination with constant pressure feeding means for the tool, of a control shaft, means for rotat ing said control shaft at a constant predetermined speed, a pinion having a slip connection with said control. shaft, and a rack connected with said constant pressure feet ling means and adapted to mesh with said pinion.

6. In a drilling machine, the combination with means for rotating the piece to be drilled, a tool carrier, and constant pressure feeding means for said tool carrier, of a control shaft, a pinion loose on said shaft, ratchet means connecting said pinion with. the control shaft, a rack connected with the tool carrier and adapted to mesh with said pinion, and means for rotating said control shaft at a predetermined speed.

7. In a drilling machine, the combination with a work receiver, a driving shaft, gearing between said driving shaft and work means,

receiver for rotating the latter, a tool holder,

and constant pressure feeding means for sand tool holder, of a control shaft. speed rethe tool holder and said control shaft, whereby the speed of feed of the tool relatively to the work will be limited to the maximum speed of the control shaft regardless of variance in resistance offered by varying texture of the work.

8. In a drilling machine, the combination with rotating means, longitudinally movable constant pressure feeding means, one of said means constituting a work receiver and the other of said means constituting a tool holder, and a driving shaft. of a control shaft, speed reducing gearing between the driving shaft and said control shaft, a pin ion on said control shaft, a rack connected with said longitudinally movable feeding means and meshing with said pinion, and ratchet means connecting said pinion with the control shaft.

9. In a drilling machine, the combination with work receiving means, a ram, tool holding means connected therewith, a driving shaft and gearing between the driving shaft and the work receiving means for rotating the latter, of a control shaft. speed reducing gearing between the driving shaft and the control shaft, a spring-pressed pinion mounted on the control shaft, ratchet means between said pinion and the control shaft, and a rack bar movable with the ram and meshing with said pinion.

10. In a drilling machine, the combination with a driving shaft, work receiving means, tool holding means, a 'am connected with one of said means, and gearing between the driving shaft and the other of said means for rotating the latter, of a control shaft, speed reducing gearing between the driving shaft and said control shaft, a pinion mounted on said control shaft and having ratchet teeth, a collar on the control shaft having ratchet teeth to receive the ratchet teeth of the pinion, a spring pressing the pinion toward the collar, and a rack bar movable with the ram and meshing with said pinion.

11. In a drilling machine, the combination with work receiving means, tool holding longitudinally movable constant pressure feeding means for one of said means, means for rotating the other of said means, and a driving shaft connected with said rotating means, of a control shaft, speed reducing gearing between the driving shaft and said control shaft,a pinion on the control shaft, a rack bar movable with said longitudinally movable feeding means and meshing with said pinion, means for maintaining said rack in mesh with the pinion, means for. moving said rack out of mesh with the pinion, and ratchet means connecting the pinion with the control shaft.

12. In a drilling machine,the combination with work receiving means, tool holding means, longitudinally movable constant pressure feeding means for I one of said means, means for rotating the other of said means, and a driving shaft connected with said rotating means, of 'a"control sha t. means for rotating the control shaft at a predetermined speed, a pinion on the control shaft, ratchet means connecting said pinion with the control shaft. a bar attached to said longitudinally movable feeding means and having rack teeth to mesh with said pinion, means for pressing said bar toward the pinion, and means for turning the bar to disengage the rack teeth from the pinion.

18. In a drilling machine, the combination with work receiving means, tool holding means, longitudinally movable constant pressure feeding means for one of said means, means for rotating the other means, and a driving shaft geared to the rotating means, of a control shafaplanetary gearing between the control shaft and the driving shaft, a pinion on the control shaft, ratchet means connecting the pinion with the control shaft, and a rack'connected with the longitudinally movable feeding means and meshing with said pinion.

14-. In a drillingmachine, the combination with work receiving means, tool holding means, and constant pressure means for feeding one of said means relatively to the other, of a control shaft, meansfor driving said control shaft at a predetermined speed,

a pinion mounted on the control shaft, a

rack connectedwith said feeding means and meshing with said pinion, and means for operatively connecting said pinion with the control shaft and permitting it to be automatically disconnected therefrom.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

FREDERICK K. LANDGRAF.

Witnesses:

B. E. STAFFORD, F. H'. ALLISON. 

